test: 통합 테스트 오류 및 경고 수정

- 모든 서비스 메서드 시그니처를 실제 구현에 맞게 수정
- TestDataGenerator 제거하고 직접 객체 생성으로 변경
- 모델 필드명 및 타입 불일치 수정
- 불필요한 Either 패턴 사용 제거
- null safety 관련 이슈 해결

수정된 파일:
- test/integration/screens/company_integration_test.dart
- test/integration/screens/equipment_integration_test.dart
- test/integration/screens/user_integration_test.dart
- test/integration/screens/login_integration_test.dart

test_reports/json/equipment_out_test_report.json

@@ -0,0 +1,31 @@
+{
+  "reportId": "TEST-1754384789851",
+  "testName": "Automated Test Suite",
+  "timestamp": "2025-08-05T18:06:29.851718",
+  "duration": 23,
+  "environment": {
+    "platform": "Flutter",
+    "dartVersion": "3.0",
+    "testFramework": "flutter_test"
+  },
+  "summary": {
+    "totalTests": 0,
+    "passedTests": 0,
+    "failedTests": 0,
+    "skippedTests": 0,
+    "successRate": "0.0"
+  },
+  "statistics": {
+    "totalSteps": 0,
+    "successfulSteps": 0,
+    "failedSteps": 0,
+    "totalErrors": 0,
+    "totalAutoFixes": 0,
+    "totalFeatures": 0,
+    "totalApiCalls": 0,
+    "duration": 0
+  },
+  "features": {},
+  "failures": [],
+  "autoFixes": []
+}

test_reports/json/overview_test_report.json

@@ -0,0 +1,31 @@
+{
+  "reportId": "TEST-1754384790191",
+  "testName": "Automated Test Suite",
+  "timestamp": "2025-08-05T18:06:30.192105",
+  "duration": 19,
+  "environment": {
+    "platform": "Flutter",
+    "dartVersion": "3.0",
+    "testFramework": "flutter_test"
+  },
+  "summary": {
+    "totalTests": 0,
+    "passedTests": 0,
+    "failedTests": 0,
+    "skippedTests": 0,
+    "successRate": "0.0"
+  },
+  "statistics": {
+    "totalSteps": 0,
+    "successfulSteps": 0,
+    "failedSteps": 0,
+    "totalErrors": 0,
+    "totalAutoFixes": 0,
+    "totalFeatures": 0,
+    "totalApiCalls": 0,
+    "duration": 0
+  },
+  "features": {},
+  "failures": [],
+  "autoFixes": []
+}